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Render time
show user profile  Justin101
Hey all,

Im doing some dusk shots of houses like the example below, but render time
is really high. Im using Vray in 3ds max 2011. Image Sampler is Adaptive DMC,
Indirect Illumination is set as, primary - Irradiance Map and secondary - Brute Force
with a LOW Irradiance map preset. DMC sampler noise threshold is set to 0.009.
So much of my settings are already at the lower end.

However, I have really bumped up the subdivisions on much of the textures to get
rid of those annoying white dots. I have set the subdivisions on much of the reflective
textures to 60-80. Do high subdivisions really beef up render time? Currently a 3508
wide render takes between 3.5 to sometimes 8-9 hours depending on how many lights I have.

Any thoughts to decrease render time?

read 468 times
8/11/2015 11:17:59 AM (last edit: 8/11/2015 11:23:45 AM)
show user profile  STRAT
its all optimisation.

on my 5 year old 8 core that render at 3500 px would take around 45 mins.

i dont know how you optimise in Max, but for starters i'd definitely substitute the secondary BF for LC.
i'd then pre-cache my gi solution at 1600 px. i'd leave all other settings to default.


read 458 times
8/11/2015 12:19:32 PM (last edit: 8/11/2015 12:19:32 PM)
show user profile  Justin101
Thanks for your reply. Can you please explain what you mean by optimise?

Also can you please explain what you mean by "i'd then pre-cache my gi solution at 1600 px."
I am not farmiliar with that. Maybe send a good link explaining.
Any help would be much appreciated.
read 449 times
8/11/2015 12:46:59 PM (last edit: 8/11/2015 12:46:59 PM)
show user profile  STRAT
optimise means to find the best/fastest settings you can. optimisation is the 3d render's holy grail.
there are a lot of 'standard' optimisations you can make, but most will need to be made in conjunction with individual scenes. this is where experience will step in.

as for pre-caching? i like to pre-cache my gi solutions at at-least half final render size (gi solutions are 3d and not scale reliant). so, for a 3500 px render i'd pre-cache my solution at maybe 1600 pixels or so, then use that for my final render, meaning for final render there's no pre-caching and gi calculations to be done.

I'm a C4D Vray man, so anything for Max Vray i dont know i'm sorry.


read 445 times
8/11/2015 12:53:47 PM (last edit: 8/11/2015 12:54:30 PM)
show user profile  STRAT
on a side note as well, generally vray's defaults are pretty good for the majority of rendering. Experimenting nubes who wander and stray from these settings can very quickly end up massing on the render time without any knowledge of why and wherefore.


read 440 times
8/11/2015 2:43:32 PM (last edit: 8/11/2015 2:43:32 PM)
show user profile  donvella
set your secondary cache to light cache, 800 is enough. in ur IR set your min rate -3 and max rate -2. thats plenty for this. I dont see why you would need to change the DMC sampler much at all.

read 415 times
8/12/2015 12:33:55 AM (last edit: 8/12/2015 12:33:55 AM)
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